Exploring activity levels in physical education lessons in the UK: a cross-sectional examination of activity types and fitness levels.
Nick BealeEmma EldridgeAnne DelextratPatrick EsserOliver BushnellEmily CurtisThomas M WassenaarCatherine WheatleyHeidi Johansen-BergHelen DawesPublished in: BMJ open sport & exercise medicine (2021)
NCT03286725.